New add-on manager

Here, new labels debut for Firefox 3.7 alpha 6, released just a few days after alpha 5. Upcoming versions of Firefox will let you manage your add-ons from a new about:addons window.

Mozilla intends its next-generation plug-in architecture to debut in Firefox 4, but it hasn't appeared in the nightlies yet. You can add it to both nightlies and more stable versions of Firefox as an add-on called JetPack.